Hi everyone and, first of all, sorry for my english!

Could someone let me understand the difference between kind of input, such as input-coils, input-holding, input-reg and input-discrete?

Also indicate another topic where I can find it,  tried to check using find box but without right results.

Thanks a lot

This explains modbus and your question pretty well.
http://www.simplymodbus.ca/faq.htm#Stored

Thanks a lot SSPW! That's exactly I'm looking for.